60 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. IX. 



Bill, less than one inch wide near tip; head, lined and speckled 

 with brown and brownish white ; speculum, not metallic green; axillars, 

 white, barred with brown; rump and tail coverts, brown, narrowly 



edged and banded with white; feet, 

 dusky (female ) . Dafila acuta. 



Pintail Duck. 



Axillar. Dafila acuta. See No. 49. 



Belly, white, with more or less brown spots; axillars, white; bill, 

 less than .90 wide at widest part (female). 



Chaulelasmus streperus. 

 Gadwall. 



See No. 42. 



Belly, more or less spotted; throat, white; rump, olive brown; 

 secondaries, metallic green, tipped with white; axillars and under 

 wing coverts, heavily barred; toes, yellowish in life (female). 



Aix sponsa. 



Wood Duck. Summer Duck. 

 See No. 50. 



* GROUP 3. Wing, from TO to 14 inches long. 



SECTION 1. Hind toe, without membraneous lobe or flap; belly, 

 white, sometimes faintly tinged with dusky or gray on lower part. 



Axillars, white; the shafts, white; ex- 

 posed speculum, black and white; head, 

 tawny brown; cheeks and throat, tawny, 

 speckled with brown (male). 



Chaulelasmus streperus. 

 Gadwall. Creek Duck. 

 See No. 42. 



Axillars, white; the shafts, white; head, 

 speckled ; exposed speculum, black and white 

 (female ) . 



Chaulelasmus streperus. 

 Gadwall. Creek Duck. 

 See No. 42. 



* For directions for measurement, see page 21. 



